21211477411212 has 144 divisors (see below), whose sum is σ = 60115402593792. Its totient is φ = 6249597171840.

The previous prime is 21211477411181. The next prime is 21211477411247.

21211477411212 is a `hidden beast` number, since 2 + 1 + 21 + 1 + 4 + 7 + 7 + 411 + 212 = 666.

21211477411212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20341123 + ... + 21358469.

It is an arithmetic number, because the mean of its divisors is an integer number (417468073568).

Almost surely, 2^{21211477411212} is an apocalyptic number.

21211477411212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21211477411212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30057701296896).

21211477411212 is an abundant number, since it is smaller than the sum of its proper divisors (38903925182580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21211477411212 is a wasteful number, since it uses less digits than its factorization.

21211477411212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018828 (or 1018823 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

It can be divided in two parts, 2121147 and 7411212, that added together give a palindrome (9532359).

The spelling of 21211477411212 in words is "twenty-one trillion, two hundred eleven billion, four hundred seventy-seven million, four hundred eleven thousand, two hundred twelve".